/*
 * Copyright (c) 2013 Ambroz Bizjak
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef AMBROLIB_CONSTEXPR_MATH_H
#define AMBROLIB_CONSTEXPR_MATH_H

#include <math.h>

namespace APrinter {

static constexpr double ConstexprFmax (double a, double b)
{
    return
        __builtin_isnan(a) ? b :
        __builtin_isnan(b) ? a :
        (a == INFINITY) ? a :
        (b == INFINITY) ? b :
        (a == -INFINITY) ? b :
        (b == -INFINITY) ? a :
        (a == b) ? (__builtin_signbit(a) ? b : a) :
        ((a > b) ? a : b);
}

static constexpr double ConstexprFmin (double a, double b)
{
    return
        __builtin_isnan(a) ? b :
        __builtin_isnan(b) ? a :
        (a == -INFINITY) ? a :
        (b == -INFINITY) ? b :
        (a == INFINITY) ? b :
        (b == INFINITY) ? a :
        (a == b) ? (!__builtin_signbit(a) ? b : a) :
        ((a < b) ? a : b);
}

static constexpr double ConstexprRound (double a)
{
    return (__builtin_isnan(a) || a == -INFINITY || a == INFINITY) ? a : __builtin_round(a);
}

}

#endif
